photo_show.php helper

hi guys,.... I have a photo_show helper which works on 1.2 pre Beta version,... 

now I'm trying to migrate to 1.3 and I can't bring it up in a view: 

   <?php echo $html->link($photoShow->thumb($user_obj), '/photos/index/' . $user_obj['User']['username'], false, false, false) ?>

what am I doing wrong...??? 

thanks 

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